It turns out Bryant Park is just the first of many New York City parks that will be given ad-supported wifi:
"Wi-Fi Salon intends to activate 18 wireless "hot spots" by the end of next month at Battery, Central and Riverside Parks and in Washington and Union Squares in Manhattan; at Prospect Park in Brooklyn; at the Flushing Meadows-Corona Park in Queens; and at Pelham Bay and Van Cortlandt Parks and Orchard Beach in the Bronx."
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